Active decoupling and power management circuit for line-powered ringing generator
US6690792B1 · kind B1 · utility
38Cited by
8References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1999 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Nov 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A ringing voltage power management circuit is configured to extract an isolated high-value intermediate voltage from a central office powered digital subscriber line through a current limiting circuit, and to charge a storage capacitor that serves as an energy reservoir for the ring generator of a subscriber line circuit. The storage capacitor and the current limiting circuit isolate the peak power drawn by the ringing load from the telephone line and translate the ringing signal's (20 Hz) ripple to the sub-Hz oscillations of the ringing cadence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.